Method and apparatus for managing handovers in a wireless network

ABSTRACT

A system that incorporates the subject disclosure may include, for example, monitoring a speed and an acceleration of a mobile communication device in a serving cell of a wireless network where the mobile communication device has a radio resource control connection with the wireless network, and selecting a first mobility speed group from among a plurality of mobility speed groups based on the speed and the acceleration of the mobile communication device, where handover parameter values are assigned to each speed group of the plurality of mobility speed groups, and where the handover parameters and their associated values are utilized for a handover by the wireless network from the serving cell to a target cell. Other embodiments are disclosed.

FIELD OF THE DISCLOSURE

The subject disclosure relates to a method and apparatus for managinghandovers in a wireless network.

BACKGROUND

Wireless communication for mobile devices on the move is based in parton handovers between a serving cell and a target cell. According to the3^(rd) Generation Partnership Project (3GPP) Technical Specification36.331, an end user device in an RRC_CONNECTED mode monitors the numberof occurring handovers within a time interval (i.e., TCRmax) to detectchanges in its mobility state. Assuming num_HOs handover events withinTCRmax, the end user device moves to medium mobility ifNCR_H>num_HOs>NCR_M and to high mobility state if num_HOs>NCR_H. Oncethe mobility state has been determined, the Radio Resource Control (RRC)parameter timeToTrigger is scaled by a speed dependent factor (i.e.,sf-Medium or sf-High).

BRIEF DESCRIPTION OF THE DRAWINGS

Reference will now be made to the accompanying drawings, which are notnecessarily drawn to scale, and wherein:

FIG. 1 depicts an illustrative embodiment of a communication system thatprovides wireless communication services;

FIG. 2 depicts an illustrative embodiment of a portion of the system ofFIG. 1 that can be utilized in providing the wireless communicationservices;

FIG. 3 depicts an illustrative embodiment of an eNodeB that can beutilized in providing wireless communication services;

FIG. 4 depicts an illustrative embodiment of a method for triggeringspeed and acceleration measurements for an end user device;

FIGS. 5-6 depict illustrative embodiments of systems for triggeringspeed and acceleration measurements for an end user device;

FIGS. 7-8 depict illustrative embodiments of flow charts for triggeringspeed and acceleration measurements for an end user device;

FIGS. 9-10 depict illustrative embodiments of systems for triggeringstopping speed and acceleration measurements for an end user device;

FIG. 11 depicts an illustrative embodiment of a flow chart fortriggering stopping speed and acceleration measurements for an end userdevice;

FIG. 12 depicts an illustrative embodiment of a flow chart fortransitioning between mobility speed groups;

FIGS. 13-14 depict illustrative embodiments of cell deployment and cellpool assignments;

FIG. 15 depicts an illustrative embodiment of parameter assignmentsaccording to a speed-based policy;

FIG. 16 depicts an illustrative embodiment of a method for managinghandovers in a wireless network;

FIGS. 17-18 depict illustrative embodiments of communication systemsthat provide wireless media services with handovers based on mobilityspeed group assignments;

FIG. 19 depicts an illustrative embodiment of a communication device;and

FIG. 20 is a diagrammatic representation of a machine in the form of acomputer system within which a set of instructions, when executed, maycause the machine to perform any one or more of the methods describedherein.

DETAILED DESCRIPTION

The subject disclosure describes, among other things, illustrativeembodiments of performing handovers based on speed and accelerationmeasurements of an end user device. In one embodiment, thesemeasurements can be obtained without changes being necessary at the UE.In one embodiment, the system and methods can utilize network-based UEspeed measurements; UE speed group management; neighbor cell typeinformation; and/or UE speed specific handover parameters policies toimplement the handovers. One or more of the exemplary embodiments canapply UE and/or service specific handover parameter profiles that arebased in whole or in part on an assigned speed group. One or more of theexemplary embodiments can improve the time interval used for UEmeasurements, filtering and handover event triggering, such as formedium to high speed vehicular UEs. One or more of the exemplaryembodiments can prevent high speed vehicular UEs from handing over to asmall cell when adequate macro cell coverage is available. One or moreof the exemplary embodiments can reduce excessive signaling and delay byimplementing a network-based UE speed estimation.

Other embodiments are included in the subject disclosure.

One or more of the exemplary embodiments described herein are related toembodiments described in co-pending U.S. patent application entitled“Method and Apparatus for Managing Handovers in a Wireless Network Basedon Speed Group Assignments”, Attorney Docket No.2013-0858A_(—)7785-1047, the disclosure of which is hereby incorporatedby reference in its entirety.

One embodiment of the subject disclosure is a method that includesdetecting, by a system including a processor, a mobile communicationdevice having a radio resource control connection with a wirelessnetwork; and monitoring, by the system, for a first triggering eventassociated with the mobile communication device. The method can include,responsive to the first triggering event, monitoring, by the system, aspeed and an acceleration of the mobile communication device in aserving cell of the wireless network. The method can include selecting,by the system, a first mobility speed group from among a plurality ofmobility speed groups based on the speed and the acceleration of themobile communication device, where handover parameter values areassigned to each speed group of the plurality of mobility speed groups,and where the handover parameter values facilitate or are otherwiseutilized for a handover by the wireless network from the serving cell toa target cell.

One embodiment of the subject disclosure includes a server that has amemory to store executable instructions, and a processor coupled withthe memory. The processor, responsive to executing the executableinstructions, can perform operations including detecting a mobilecommunication device having a radio resource control connection with awireless network. The processor can monitor a speed and an accelerationof the mobile communication device in a serving cell of the wirelessnetwork. The processor can select a first mobility speed group fromamong a plurality of mobility speed groups based on the speed and theacceleration of the mobile communication device, where handoverparameter values are assigned to each speed group of the plurality ofmobility speed groups, and where the handover parameter values areutilized for a handover by the wireless network from the serving cell toa target cell.

One embodiment of the subject disclosure includes a computer readablestorage device including executable instructions, which, responsive tobeing executed by a processor cause the processor to perform operationsthat include monitoring a speed and an acceleration of a mobilecommunication device in a serving cell of a wireless network, where themobile communication device has a radio resource control connection withthe wireless network. The processor can select a first mobility speedgroup from among a plurality of mobility speed groups based on the speedand the acceleration of the mobile communication device, where handoverparameter values are assigned to each speed group of the plurality ofmobility speed groups, and where the handover parameter values areutilized for a handover by the wireless network from the serving cell toa target cell.

FIG. 1 depicts an illustrative embodiment of communication system 100that can provide wireless media services, such as voice, video and/ordata services to end user devices, such as communication device 116,utilizing a wireless network 150 (a portion of which is illustrated). Inone embodiment, network 150 can be a heterogeneous network having avariety of cell sizes and mobility profiles.

System 100 enables starting handover measurements early enough andprioritizing target cells so that the probability of Radio Link Failures(RLFs) related to handovers can be reduced. In order to support timelyhandovers in a heterogeneous network with a variety of cell sizes andmobility profiles, the speed of UEs can be measured and analyzed alongwith neighboring cell type information to identify a set of handoverparameter values (hereinafter referred to as handover parameters) to bechosen for each UE. In one embodiment, system 100 enables measuring thespeed and/or acceleration for each UE falling into certain measurementscriteria or categories. In one embodiment, a UE speed group managementcan monitor the mobility state for each UE and can assign each UE to aspeed group based on speed and/or acceleration measurements. In oneembodiment, handover parameters and/or neighboring cell types policy canresult in a selection of the appropriate parameter values for each UEand can result in an initiation of an RRC Connection Reconfigurationtowards the UE. In one embodiment, these three functions can beperformed at an eNodeB (or other network element(s)) and there is noadditional functionality required at the UE.

Device 116 is depicted as a mobile smart phone, but the exemplaryembodiments can be any type of communication device that provideswireless communications such as a tablet, a laptop computer, a PDA andso forth. System 100 can enable communication services over a number ofdifferent networks, such as between end user device 116 and anothercommunication device (e.g., a second end user device) not shown. In thisembodiment, the communication device 116 is in motion, as depicted byarrow 175, as a result of being with a user in a vehicle 125. Theexemplary embodiments can be applied to wireless devices that are invarious states of motion (e.g., high speed, medium speed, low speed,pedestrian, non-moving, and so forth).

Multiple forms of media services can be offered to media devices by wayof wireless access base stations 117 operating according to commonwireless access protocols such as Global System for Mobile or GSM, CodeDivision Multiple Access or CDMA, Time Division Multiple Access or TDMA,Universal Mobile Telecommunications or UMTS, World interoperability forMicrowave or WiMAX, Software Defined Radio or SDR, Long Term Evolutionor LTE, IEEE 802.11 a/b/g/n/ac/ad and so on. Other present and nextgeneration wide area wireless access network technologies can be used inone or more embodiments of the subject disclosure.

System 100 illustrates cells 101, 102 and 103 which each include a basestation 117 for providing wireless services within a coverage area ofthe cell. In this example, cell 101 is operating as the serving cell anda determination needs to be made as to which cell (e.g., cell 102 orcell 103) is to be the target cell for the handover. Server 130 (e.g.,operating as the wireless base station 117 and/or an eNodeB for thewireless network 150) can be used for identifying a UE having an RRCconnection, commencing speed and/or acceleration measurements for theidentified UE, and assigning the UE to a mobility speed group from amonga plurality of such groups based on the speed and/or accelerationmeasurements. The RRC can be a communication link that has beenestablished between the UE and one or more components of the wirelessnetwork, such as an eNodeB.

Server 130 can improve the handover robustness and retainability byproviding different mobility speed profiles having different UE and/orservice specific handover parameter profiles. The different profiles canbe assigned based on different speeds of the UEs. The server 130 canoptimize or otherwise improve the time interval, required by UE, for UEmeasurements, filtering and handover event triggering, such as formedium to high speed vehicular UEs. The server 130 can prevent highspeed vehicular UEs from handing over to a small cell (e.g., cell 103)when adequate macro cell coverage is available (e.g., via cell 102). Theserver 130 can avoid excessive signaling and delay compared to a UEbased solution (e.g., if every time the UE speed changes a report issent to the eNodeB, then the amount of signaling generated issignificant—in addition, this signaling may delay handover execution).In one embodiment, the system 100 reduces handover delay by utilizingthe resources of the network for UE speed estimation rather thanperforming calculation or making other determinations at the UE.

In one or more embodiments, server 130 can detect device 116 having aradio resource control connection with wireless network 150, and canmonitor for a first triggering event associated with the mobilecommunication device. Server 130, responsive to the first triggeringevent, can monitor a speed and an acceleration of the device 116 inserving cell 101. Server 130 can select a first mobility speed groupfrom among a plurality of mobility speed groups based on the speed andthe acceleration of the mobile communication device, where the handoverparameters are assigned to each speed group of the plurality of mobilityspeed groups, and where the handover parameters are utilized for ahandover by the wireless network from the serving cell to a target cell.

In one or more embodiments, the monitoring of the speed and theacceleration of the device 116 is based on an analysis by the server 130(without the device 116 performing the analysis) of a Doppler frequencyassociated with the radio resource control connection. In one or moreembodiments, the monitoring for the first triggering event can be basedon average path loss measurements at the serving cell 101, signalquality measurements at the serving cell, load measurements at theserving cell, a measurement of radio link failures for incominghandovers at the serving cell, or a combination thereof. In one or moreembodiments, the first triggering event can occur prior to a firsthandover for the radio resource control connection between the device116 and the wireless network without waiting for a pre-determined numberof handovers. In one or more embodiments, the server 130 can detect achange in the speed, the acceleration or a combination thereof, and canselect a second mobility speed group from among the plurality ofmobility speed groups based on the change.

System 100 can include various components that are not illustrated,including one or more of a Universal Terrestrial Radio Access Network(UTRAN), a Global System for Mobile communications (GSM) Enhanced Datarates for GSM Evolution (EDGE) Radio Access Network, and an E-UTRAN. Thesystem 100 can further include one or more of a Serving General packetradio service (GPRS) Support Node (SGSN), and a Mobility ManagementEntity (MME). Other components not shown can also be utilized forproviding communication services to the mobile device 116, such as aMobile Switching Center (MSC) which can facilitate routing voice callsand Short-Message Service (SMS), as well as other services (e.g.,conference calls, FAX and circuit switched data) via setting up andreleasing end-to-end connections, handling mobility and hand-overrequirements during the communications, and/or performing charging andreal time pre-paid account monitoring.

In one or more embodiments, system 100 can provide for circuit switchingfallback for packet switching so as to enable the provisioning of voiceand other circuit switching-domain services (e.g., circuit switching UDIvideo/LCS/USSD) by reuse of circuit switching infrastructure, such aswhen the device 116 is served by E-UTRAN. In one or more embodiments, acircuit-switching fallback enabled terminal connected to E-UTRAN may useGERAN or UTRAN to connect to the circuit switching-domain. In one ormore embodiments, circuit switching fallback and Internet ProtocolMultimedia Subsystem (IMS)-based services of system 100 can co-exist ina single service operator's network.

In one or more embodiments, the UTRAN can include node B's and radionetwork controllers which enable carrying many traffic types includingreal-time circuit-switched to IP-based packet switched traffic. TheUTRAN can also enable connectivity between the device 116 and the corenetwork. The UTRAN can utilize a number of interfaces including Iu, Uu,Iub and/or Iur. In one or more embodiments, the GERAN can facilitatecommunications between base stations (e.g., Ater and Abis interfaces)and base station controllers (e.g., A interfaces).

In one or more embodiments, the E-UTRAN can be the air interface for theLTE upgrade path for mobile networks according to the 3GPPspecification. The E-UTRAN can include enodeBs on the network that areconnected to each other such as via an X2 interface, which areconnectable to the packet switch core network via an S1 interface. Forexample, the E-UTRAN can use various communication techniques includingorthogonal frequency-division multiplexing (OFDM), multiple-inputmultiple-output (MIMO) antenna technology depending on the capabilitiesof the terminal, and beamforming for downlink to support more users,higher data rates and lower processing power required on each handset.

In one or more embodiments, the SGSN can assume responsibility fordelivery of data packets from and to mobile stations within the SGSN'sgeographical service or coverage area. The SGSN can perform functionsincluding packet routing and transfer, mobility management (e.g.,attach/detach and location management), logical link management, and/orauthentication and charging functions. In one or more embodiments, alocation register of the SGSN can store location information (e.g.,current cell) and user profiles (e.g., addresses used in the packet datanetwork) of users registered with the SGSN.

In one or more embodiments, a Home Subscriber Server (HSS) can beprovided that is a central database that contains user-related andsubscription-related information. The functions of the HSS includefunctionalities such as mobility management, call and sessionestablishment support, user authentication and access authorization. Inone embodiment, the HSS can manage subscription-related information inreal time, for multi-access and multi-domain offerings in an all-IPenvironment. The HSS can be based on Home Location Register (HLR) andAuthentication Center (AuC).

In one or more embodiments, the MME can perform the function of acontrol-node. For example, the MME can perform functions such as idlemode tracking and paging procedure including retransmissions. The MMEcan also choose a serving gateway for the device 116 such as at theinitial attach and at time of intra-LTE handover involving noderelocation.

In one or more embodiments, a Serving Gateway (SGW) can route andforward user data packets, while also acting as the mobility anchor forthe user plane during inter-eNodeB handovers and as the anchor formobility between LTE and other 3GPP technologies (e.g., terminating S4interface and relaying the traffic between 2G/3G systems and PGW). Foridle state UEs, the SGW can terminate the downlink data path and cantrigger paging when downlink data arrives for the UE. The SGW can manageand can store UE contexts, e.g. parameters of the IP bearer service,network internal routing information.

In one or more embodiments, a PDN Gateway (PGW) can provide connectivityfrom the device 116 to external packet data networks by being the pointof exit and entry of traffic for the UE. In one or more embodiments, thedevice 116 can have simultaneous connectivity with more than one PGW foraccessing multiple PDNs. The PGW can perform policy enforcement, packetfiltering for each user, charging support, lawful interception and/orpacket screening. The PGW can also act as the anchor for mobilitybetween 3GPP and non-3GPP technologies such as WiMAX and 3GPP2 (CDMA 1Xand EvDO).

FIG. 2 depicts an illustrative embodiment of a portion of system 100 ofFIG. 1 that can be utilized in providing the wireless communicationservices. Server 130 can compensate for the fact that the smaller thecell size the shorter the Time of Stay for faster moving UEs (e.g.,vehicular) and the lesser time is available for measuring and evaluatingneighboring cells. Server 130 can start the handover measurements earlyenough and prioritize target cells so that the probability of RLFsduring handover can be reduced. At 210, the speed of each UE can bemeasured and the measurement result can be utilized with neighboringcell type information pointing to the appropriate set of handoverparameters to be chosen for each UE's motion characteristics at 220.

FIG. 3 depicts an illustrative embodiment of an eNodeB that can beutilized in providing wireless communication services utilizingassignments to mobility speed groups. In one embodiment, differentfunctions can be implemented at the server 130. For example, a UE speedmeasurement function can measure the speed and acceleration for each UEfalling into certain measurement criteria. A UE speed group managementfunction can monitor the mobility state for each UE and can assign eachUE to a speed group based on speed and acceleration measurements. Ahandover parameters and neighboring cell types policy function canselect the appropriate parameter values for each UE and initiate an RRCConnection Reconfiguration towards the UE. All three functional entitiesmay reside at an eNodeB, in a different network element, such as aseparate HW/SW entity, or in both in a distributed environment (e.g.,measurement functions residing at the eNodeB while policy functionsreside at the HW/SW entity). In one embodiment, there is no additionalfunctionality required at the UE to perform the handover based onassignment to mobility speed group.

In one or more embodiments, the server 130 can utilize an analysis ofthe Doppler effect to estimate or otherwise determined the speed and/oracceleration of the UE. Various methods of measuring the Dopplerfrequency (e.g., at eNodeB) can be performed while the UE is in the RRCCONNECTED mode. For example, the frequency offset can be estimated basedon the phase differences of reference symbols (or pilot symbols)received at the eNodeB. From the measured Doppler frequency offset,f_(d), the relative speed between the transmitter and the receiver,hence the UE speed, can be estimated by the formula:

f _(d) =f*v/c,  (1)

where f is the carrier frequency, v is the relative speed between the UEand the eNodeB and c is the speed of electromagnetic waves. Othermethods of measuring the UE speed and/or acceleration can includemeasuring the fast fading change while the UE is in the RRC_CONNECTEDmode.

In one or more embodiments, UE speed measurements can be configured tobe always on or triggered by certain monitored events. In oneembodiment, a continuous mode 400 is illustrated in FIG. 4, the server130 can measure (e.g., continuously, periodically and/or based on aschedule) the speed of selected UEs in RRC_CONNECTED mode. When atransition from RRC_IDLE to RRC_CONNECTED mode, or a successful incominghandover, occurs, then the server 130 can check the number of UEscurrently monitored and the QCI class of the connection. As long as bothare within limits or thresholds (e.g., pre-determined or dynamicthresholds based on a number of factors such as network conditions,historical data, time of day, and so forth), the server 130 can startmeasuring the UE speed, such as described above utilizing an analysis ofthe Doppler frequency.

In one or more embodiments, an event triggered mode may be utilized forcontrolling whether or not speed and acceleration measurements are beingperformed for the UE's. Certain events in the network, such as at theserving cell and/or at the neighboring cell(s), may initiate the startof UE speed measurements at server 130 (e.g., the serving eNodeB). Forexample, these triggering events can be related to RF coverage, RFquality and/or high level performance monitoring functions within theradio network (e.g., Self Optimizing Network (SON)).

In one embodiment in FIG. 5, for those UEs in RRC CONNECTED mode, speedmeasurements by server 130 may start when the average path loss at theserving cell exceeds a predefined threshold, which can indicate that theUE is moving close to the edge of serving cell coverage area. In one ormore embodiments, the path loss event can be triggered either in uplink(e.g., at the eNodeB) or in downlink at the UE and then forwarded to theUE Speed Measurement (UESM) function (e.g., residing at the servingeNodeB).

System 500 can implement the exemplary speed measurement techniques incombination with RRC protocol event triggers described in 3GPP TS36.331, the disclosure of which is hereby incorporated by reference. Inthis example, a small cell has been deployed as a coverage solutionextending the macro cellular network service area and the UE can makeuse of the RRC Event A2 (Serving cell becomes worse than threshold):

RSRP _(Serving)|_(dB)<Thresh|_(dB)

where RSRP_(Serving) is the signal strength of the pilot sequencereceived from the serving Cell A and Thresh is a threshold value, suchas configured by the operator or service provider or SON function. Atthe serving base station, the difference between the transmitted powerof the pilot sequence and the UE received signal strength value (for thepilot sequence) can be calculated. When this value exceeds a certainthreshold then a speed measurement event is triggered towards the UEspeed measurement function (e.g., residing at the eNodeB).

In one embodiment in FIG. 6, for those UEs in RRC CONNECTED mode, speedmeasurements by server 130 may start when the signal quality of theserving cell becomes worse than a predefined threshold, which canindicate that a UE is moving close to the edge of serving cell coveragearea. The signal quality event can be triggered either in uplink (e.g.,at the eNodeB) or in downlink at the UE and then forwarded to the UESMfunction (e.g., residing at the serving eNodeB).

System 600 can implement the exemplary speed measurement techniques incombination with RRC protocol event triggers described in 3GPP TS36.331. In this example, a small cell has been deployed as a capacitysolution, enhancing macro cellular network capacity at the specificlocation, and the UE can make use of the Event A2 (serving cell becomesworse than threshold):

RSRQ _(Serving)|_(dB)<Thresh|_(dB)

where RSRQ_(Serving) is the signal quality of the pilot sequencereceived from the serving Cell A and Thresh is a threshold valueconfigured by the operator or SON function. At the serving base station,upon reception of RRC Event A2, a speed measurement event can betriggered towards the UE speed measurement function (e.g., residing atthe eNodeB).

In one or more embodiments, for those UEs in RRC CONNECTED mode, speedmeasurements by the server 130 may start when the load at the servingcell becomes higher than a threshold (such as a pre-defined threshold ora dynamic threshold that is adjusted based on one or more factors, suchas network conditions, historical data and so forth). The load event canbe triggered either for uplink or downlink air interface load, orbackhaul load (e.g., at the eNodeB) and then forwarded to the UESMfunction to start UE speed measurements.

RLFs during handovers can be reported by UEs upon request from thenetwork using the 3GPP RRC protocol UEInformationRequest procedure. ASON function (e.g., centralized or local at the neighboring eNodeB) canevaluate and decide if handover related RLFs are due to the fact that UEspeed is below or exceeds a threshold. In this example, the UE speedevent can be detected at a target cell and can be traced back to theserving cell. As a result, the serving cell can initiate UE speedmeasurements for each UE in an RRC_CONNECTED mode and can apply speedspecific handover configuration for each UE.

Referring to FIG. 7, flow chart 700 illustrates the procedure for thetriggering event being a serving cell load. This procedure can be splitinto four phases: A) logging configuration; B) RLF detection by SON; C)UE measurements reporting; and D) Evaluation and decision by SON. At701, the UE initiates logging (while at the serving cell) afterreceiving the RRC LoggedMeasurementConfiguration message. At 702, theneighboring cell can request the UE to provide information regarding RLFrelated to handover, such as upon occurrence of any of the followingevents: An RRCReconfigurationComplete or RRCConnectionRestablishmentmessage sent by a UE when an incoming handover or transition fromRRC_IDLE to RRC_CONNECTED occurs at the Neighboring Cell; and a SONfunction, i.e. central or local, detects incoming handover issue that isrelated to UE speed. UE speed related issues can be identified by, butnot limited to: a high number of X2 or S1 incoming handover preparationand/or execution attempts from a neighboring cell and a relatively smallnumber of RRCReconfigurationComplete messages (indicating successfulhandover) from that particular cell.

At 703, the eNodeB can send an RRC UEInformationRequest message to theUE with rlf-ReportReq-r9 indicator set to true. At 704, the UE can senda UEInformationResponse message which contains rlf-Report-r10 includingthe following Information Elements (IE): LocationInfo-r10 (locationCoordinates; horizontal Velocity; and bearing and horizontalSpeed);measResultLastServCell-r9: SEQUENCE {rsrpResult-r9, rsrqResult-r9};failedPCellId-r10 CHOICE {cellGlobalId-r10, or (physCellId-r10,carrierFreq-r10)}; and connectionFailureType-r10=hof. At 705, theUE-reported RFLs due to handover are evaluated by a distributed SONentity at target eNodeB or by a centralized/hybrid SON entity. AMobility Robustness Optimization (MRO) speed event can be triggered ateNodeB or centralized/hybrid SON when the number of RLFs due to handoverfailures for a specific ECGI or (PCI, ARFCN) has exceeded a thresholdand the speed reported by those UEs falls in the medium or the highspeed range.

At 706, the neighboring cell (where the RLF was reported) can initiate aUE speed event request towards the serving cell (where the high RLFs dueto HO occurred) via X2 interface if cells belong to different eNodeBs.In the case where both Serving and Neighboring Cells belong to the sameeNodeB the UE speed event can be forwarded over an eNodeB internalinterface. At 707, the serving cell upon reception of the UE speed eventcan start UE speed measurements. LTE positioning protocol can allow forspeed and bearing measurements and for the location and horizontal speedinformation to be sent to the eNodeB as part of the MRO related info. Inone or more exemplary embodiments of flow chart 700, the cells canreside in the same or different eNodeBs.

In one or more embodiments, a local SON function at the serving cell (ora centralized SON function at a network node connected to the servingcell) may detect performance degradation based on various performancefactors or criteria, such as session/call retainability, handoverperformance, throughput, and/or latency, and consequently can trigger aUE speed measurement event at the serving cell for each serving UE inRRC_CONNECTED mode.

Method 800 of FIG. 8 illustrates this procedure. At 801, handoverfailures that result into RLF events are captured or otherwiseidentified by either or both of a local or a central SON function thatmonitors the retainability performance at the serving cell. At 802 aand/or 802 b, the SON can detect that RLFs (due to handover) exceed athreshold. In one embodiment, the SON can identify that the UE speed isthe root cause. For example, drops due to handovers can be detectedbased on, but not limited to, at the serving cell a number of RLFs dueto outgoing handover failures exceeds a certain threshold and the ratiodefined by the number of handover attempts over the number of newcalls/sessions exceeds a certain threshold indicating pass throughtraffic. The SON function can reside in either or both of the OSS oreNodeB, such as a central SON function in the OSS or a local SONfunction in the eNodeB. At 803 and 804, the eNodeB can start the UEspeed measurements based on the triggering event. One or more of thesteps described in FIG. 4 can be employed following step 804. In one ormore exemplary embodiments, cells can reside in the same or differenteNodeBs.

FIGS. 9-10 depict illustrative embodiments of systems for triggeringstopping speed and acceleration measurements for an end user device.

When the average path loss at the serving cell becomes smaller than apredefined threshold, indicating that a UE is moving closer to theantenna of the serving cell, speed measurements may be suspended orotherwise stopped at the serving cell, as in system 900. In this examplethe UE can make use of the reporting of the Event A1 (serving becomesbetter than threshold).

RSRP _(Serving)|_(dB)>Thresh|_(dB)

where RSRP_(Serving) is the signal strength of the pilot sequencereceived from the serving Cell A and Thresh is a threshold valueconfigured by the operator.

When the signal quality at the serving cell becomes better than apredefined threshold, indicating that a UE is moving closer to theantenna of the serving cell, speed measurements may be suspended orotherwise stopped at the serving cell, as in system 1000.

In one or more embodiments, for those UEs in RRC CONNECTED mode, speedmeasurements may stop when the load at the serving cell becomes lowerthan a predefined threshold. The load event can be triggered either foruplink or downlink air interface load, or backhaul load at the eNodeBand then forwarded to the UESM function to stop the UE speedmeasurements.

In one or more embodiments, a neighboring cell SON entity can detectRLFs (due to handover) being below a threshold. For example, a SONfunction (i.e., centralized and/or local at the neighboring eNodeB) mayevaluate and decide that handover related RLFs are below a threshold ornot related to UE speed. In such a case, the UE speed measurements maybe suspended at the serving cell. This procedure is illustrated in flowchart 1100 of FIG. 11. At 1101, a local SON function at the serving cell(and/or a centralized SON function in a network node that is connectedto the serving cell) may evaluate and decide that handover related RLFsare below a threshold and/or not related to UE speed. At 1102, the SONcan initiate a UE speed event to stop the UE speed measurements for allUEs in RRC_CONNECTED mode which occurs at 1103.

In one or more embodiments, potential UE speed measurement errors maylead to inappropriate adaptation of handover parameters which wouldimpact handover performance by generating unnecessary or improperhandover events. In one or more embodiments, in addition to speedmeasurements, acceleration measurements can also be used to classify aUE into a certain speed group from among a plurality of speed groups. Inthis example, both speed and acceleration measurements are forwarded tothe speed group management function where the speed classification takesplace. In one embodiment, two or more speed measurements are utilized tocalculate the UE acceleration.

After the first set of speed and acceleration measurements has beenprocessed (e.g., at the eNodeB), a UE gets assigned to a speed group.Any number and configuration of speed groups can be used in theexemplary embodiments, such as a pedestrian speed group, a vehicular lowspeed group, a vehicular medium speed group, and a vehicular high speedgroup. In one embodiment, a certain number of speed measurement samplescan be required to fall within the boundaries of a speed group andacceleration should be within a certain region.

In one or more embodiments, as the UE changes its speed over time, aspeed group change may be triggered. Both UE speed and acceleration canbe used as criteria for a transition from one speed group to another. Inone embodiment, if the speed measurement result exceeds the currentlyassigned speed group upper boundary and a monotonous increase of speedhas been detected within a time interval (e.g., a positiveacceleration), then a transition to a higher speed group can occur. Ifthe speed measured exceeds the currently assigned speed group upperboundary but the speed does not show a monotonous increase within a timeinterval (e.g., a positive acceleration), then a transition to a higherspeed group may not occur. If the speed measurement result is below thecurrently assigned speed group lower boundary and a monotonous decreaseof speed has been detected within a time interval, (e.g., a negativeacceleration) then a transition to a lower speed group may occur. If thespeed measured is below the currently assigned speed group lowerboundary and the speed did not show monotonous decrease within a timeinterval (e.g., a negative acceleration), then a transition to a lowerspeed group may not occur. In one or more embodiments, in order to avoida UE oscillating between speed groups (e.g., a red light environment), atime delay can be applied for a UE that exceeds a certain number ofspeed group transitions within a predefined time interval.

FIG. 12 depicts an illustrative embodiment of a flow chart 1200 for anexemplary speed group classification procedure. At 1201, UE speed andacceleration measurements can start. This can include an initial UEspeed group selection. At 1202, there can be a transition from a lowerto a higher speed group. At 1203, there can be a transition from ahigher to a lower speed group. At 1204, the UE speed measurements canstop.

In one or more embodiments, a macrocell is a cell that provides radiocoverage in a wide geographical area, from few hundred meters to fewkilometres, while a small cell is a cell that provides radio coverage ina small geographical area, such as less than 500 m. Small cells can bedeployed either outdoors or indoors as “Coverage” and “Capacity”solutions to macro radio network problems. Table 1300 of FIG. 13illustrates different deployment scenarios for small cells.

Different small cells deployment can utilize or otherwise requiredifferent handover configuration profiles, e.g., a capacity outdoorsmall cell may not be expected to serve high speed UEs crossing itscoverage footprint, while a coverage outdoor small cell may be expectedto serve medium to high speed UEs in the absence of macro radiocoverage. In one or more embodiments, the network (e.g., the eNodeB) canbe able to distinguish between these two types. In one embodiment, inorder to distinguish between Coverage and Capacity types of small cells,two dedicated pools of Physical Cell Identifiers (PCIS) for small cells,(one for Coverage and one Capacity) can be configured at the eNodeB, asillustrated in table 1400 of FIG. 14, where j, k, l and mε[1, 502].

In one or more embodiments, neighboring small cell list can beforwarded. For fast moving UEs, the time the UEs spend to identify andmeasure neighboring cells may be significant or critical to theirhandover performance. In order to speed up PCI decoding and consequentlyL1 measurements for small cells, the serving eNodeB can send theneighboring list of small cells to its UEs via the RRC protocolRRCReconfiguration message using the information element (IE)cellsToAddModList The RRCReconfiguration can be used to signal thetransition from RRC IDLE to RRC CONNECTED, or successful incominghandover. A number of different technique can be used for forwardingthis data. In one embodiment, the eNodeB can send the small cellsneighboring list to all UEs prior to the UE speed measurements starting.In another embodiment, the eNodeB can send the small cells neighboringlist together with UE speed specific handover parameters only for thoseUEs moving above a threshold speed such as a defined medium or highspeed. In one embodiment, the list of neighboring small cells can residein the eNodeB and/or in a different node within the network.

In one embodiment, desired values of handover related parameters candepend on the speed of the UE. For example, a parameter specifying thetype of averaging, such as a filter coefficient applied to ReceivedSignal Strength (RSS) or Received Signal Quality (RSQ) measurements, canbe different for a slow-moving UE as opposed to a fast-moving UE. Inthis example, handover parameters specific to a speed group may beassigned or otherwise provided to the UE to further reduce the time ittakes for a UE to measure, evaluate and trigger the RRC mobility eventto the network.

In addition to UE speed specific parameter settings, the service type,the cell type, and/or the cell size can be considered as part of thehandover parameters values selection process. For example, differentservices can have different tolerances to handover interruption time.For instance, background services, web browsing, email, and so forth cantolerate longer handover interruption time than telephony services. Inone embodiment, the handover policy can be based on the service type. Inone embodiment, blacklisting of certain PCIs may be performed in orderto avoid handovers to small cells for certain type of services and UEspeed groups (e.g., fast-moving UEs). For example, in LTE, each servicetype or group of services can be mapped to a Quality of Service (QoS)Class Identifier (known as QCI) to facilitate the consideration of theservice type in the handover policy.

In one or more embodiments, whether to allow high speed UEs in smallcells can depend on the type of deployment drivers (e.g. outdoorcoverage vs. outdoor capacity) and can also depend on at what UE speed ahandover event to a small cell is beneficial from both the subscriberQoS point of view and network capacity point of view. In one embodiment,small cells can be deployed in the presence of good RF coverage providedby the macro cellular network, therefore high speed UEs may not bepermitted to hand-in from macro cellular network. In one embodiment, inorder to prevent handovers from macro cellular network, which covers alarge geographical area to a small cell, which covers a smallgeographical area, a high speed UE can suspend measurements for thosecapacity-marked-small cells, e.g., the eNodeB can communicate viadedicated signaling (to those high speed UEs) the PCIs of Capacity smallcells that are blacklisted.

In one or more embodiments, it can be desirable to allow high speed UEs(e.g., greater than 50 km/h) to hand-in from macro cells. For higherspeed, the RLF rate can increase as speed increases due to missedhandover opportunities. One or more of the exemplary embodimentsprovides for faster handover triggering for those fast moving UEs whichcan reduce the number of RLFs. The exemplary embodiments can lessen thetime required for measurement, filtering, decision, preparation andexecution. A shorter L1 to L3 reporting time and a smaller K value of L3filtering can be employed. Also, the reduction of DiscontinuousReception (DRX) cycle duration or even the suspension of DRX cycle(s)can be utilized in one or more embodiments to further reduce the time aUE spends on handover.

FIG. 15 depicts a table 1500 depicting an illustrative embodiment ofparameter values assigned according to a speed-based policy that can befurther communicated to a UE via an RRC dedicated signaling message.Some of the handover parameters together with indicative values for eachUE speed type (e.g., low, medium, high) are listed. It should beunderstood that these parameter values are examples and other parametervalues can be used in addition to or in place of those in table 1500.

FIG. 16 depicts an exemplary method 1600 for assigning an end userdevice to a mobility speed group to facilitate handovers in a wirelessnetwork. Method 1600 can be performed by various devices or combinationsof various devices, including the eNodeB. At 1602, a mobilecommunication device (e.g., device 116 of FIG. 1) having a radioresource control connection with a wireless network can be detected. At1604, a determination can be made as to whether speed/accelerationmonitoring is to be performed based on a continuous mode or based on atriggering event mode. If the triggering event mode is to be utilizedthen method 1600 proceeds to step 1606, otherwise method 1600 proceedsto step 1610 when the continuous mode criteria have been satisfied(e.g., designated device and/or designated QCI class for the device). Inone embodiment, Various factors can be considered as to whether acontinuous mode or triggering event mode should be utilized for a UE,such as one or more of network load, type of UE, type of communicationsession, historical data (e.g., number of RLF's due to handovers), andso forth.

At 1606 when the mobile communication device is in a triggering eventmode, monitoring for a first triggering event associated with the devicecan be performed. The first triggering event can be of various types,including being associated with or otherwise determined from averagepath loss measurements at the serving cell, signal quality measurementsat the serving cell, load measurements at the serving cell, ameasurement of radio link failures for incoming handovers at the servingcell, a measurement of session retainability at the serving cell, ameasurement of incoming handover performance at a neighboring cell(target cell) that can be linked to the serving cell, a measurement ofthroughput at the serving cell, a measurement of latency at the servingcell, or a combination thereof.

At 1608, a determination can be made as to whether a triggering eventhas occurred. If the triggering event has occurred then method 1600proceeds to step 1610 otherwise the method continues monitoring for thetriggering event. At 1610, monitoring can be performed to determine aspeed and/or an acceleration of the mobile communication device in aserving cell of the wireless network. At 1612, a first mobility speedgroup can be selected from among a plurality of mobility speed groupsbased on the speed and/or the acceleration of the mobile communicationdevice. In this example, specific handover parameter values can beassigned to each speed group of the plurality of mobility speed groups.The handover parameter values can facilitate or can be utilized for ahandover by the wireless network from the serving cell to a target cell.One or more of the handover parameters can have static values that donot change or can be dynamic values that change based on various factorssuch as network conditions. Those handover parameter values can befurther communicated to a UE via an RRC dedicated signaling message.

In one embodiment, the monitoring of the speed and the acceleration ofthe mobile communication device can be based on a Doppler frequencyassociated with the radio resource control connection between the mobilecommunication device and the wireless network. In another embodiment,the first triggering event occurs prior to a first handover for theradio resource control connection between the mobile communicationdevice and the wireless network that establishes a communication sessionfor the mobile communication device. In one embodiment, method 1600 canalso include detecting a change in the speed, the acceleration or acombination thereof; and selecting a second mobility speed group fromamong the plurality of mobility speed groups based on the change. In oneembodiment, the method 1600 can include monitoring for a secondtriggering event associated with the mobile communication device; andresponsive to the second triggering event, ceasing the monitoring of thespeed and the acceleration of the mobile communication device. In thisexample, the monitoring for the second triggering event can be based onaverage path loss measurements, signal quality measurements, cell loadmeasurements, a measurement of radio link failures for incominghandovers, or a combination thereof. In one embodiment, a thresholdnumber of measurements of the speed and the acceleration of the mobilecommunication device are performed prior to selecting the first mobilityspeed group. In one embodiment, method 1600 can include detecting achange in the speed, the acceleration or a combination thereof;identifying a last change of speed group for the mobile communicationdevice; determining a time period associated with the last change; andselecting a second mobility speed group from among the plurality ofmobility speed groups based on the change and responsive to the timeperiod satisfying a minimum threshold time between speed group changes.In one embodiment, the monitoring of the speed and the acceleration ofthe mobile communication device can be based on determining a Dopplerfrequency offset according to phase differences of reference symbolsreceived by the system. In one embodiment, the monitoring of the speedand the acceleration of the mobile communication device can be based onmeasuring a fast fading change associated with the radio resourcecontrol connection between the mobile communication device and thewireless network.

FIG. 17 depicts an illustrative embodiment of a first communicationsystem 1700 for delivering media content. The communication system 1700can represent an Internet Protocol Television (IPTV) media system.Communication system 1700 can be overlaid or operably coupled withsystem 100 of FIG. 1 as another representative embodiment ofcommunication system 1700. System 1700 can provide for wireless servicesto mobile devices where handovers are managed based on the speed andacceleration of the mobile devices. System 1700 enables detecting amobile communication device having a radio resource control connectionwith a wireless network; monitoring a speed and an acceleration of themobile communication device in a serving cell of the wireless network;and selecting a first mobility speed group from among a plurality ofmobility speed groups based on the speed and the acceleration of themobile communication device. Handover parameters can be assigned to eachspeed group of the plurality of mobility speed groups, where thehandover parameters facilitate a handover by the wireless network fromthe serving cell to a target cell. In one embodiment, the monitoring ofthe speed and the acceleration of the mobile communication device can becommenced responsive to a determination of a first triggering event,where the first triggering event occurs prior to a first handover forthe radio resource control connection between the mobile communicationdevice and the wireless network.

In one embodiment, system 1700 enables monitoring for a first triggeringevent associated with the mobile communication device, where themonitoring of the speed and the acceleration of the mobile communicationdevice is commenced responsive to the first triggering event, and wherethe monitoring for the first triggering event is based on average pathloss measurements at the serving cell, signal quality measurements atthe serving cell, load measurements at the serving cell, a measurementof radio link failures for incoming handovers at the serving cell, ameasurement of session retainability at the serving cell, a measurementof handover performance at the serving cell, a measurement of throughputat the serving cell, a measurement of latency at the serving cell, or acombination thereof. In one embodiment, the monitoring of the speed andthe acceleration of the mobile communication device can be based ondetermining a Doppler frequency offset according to phase differences ofreference symbols received by the processor, measuring a fast fadingchange associated with the radio resource control connection between themobile communication device and the wireless network, or a combinationthereof. In one embodiment, a threshold number of measurements of thespeed and the acceleration of the mobile communication device can beperformed prior to the selecting of the first mobility speed group.

In one embodiment, system 1700 enables detecting a change in the speed,the acceleration or a combination thereof; identifying a last change ofspeed group for the mobile communication device; determining a timeperiod associated with the last change; and selecting a second mobilityspeed group from among the plurality of mobility speed groups based onthe change and responsive to the time period satisfying a minimumthreshold time between speed group changes. In one embodiment, thesystem 1700 enables monitoring for a second triggering event associatedwith the mobile communication device; and responsive to the secondtriggering event, ceasing the monitoring of the speed and theacceleration of the mobile communication device, where the monitoringfor the second triggering event is based on average path lossmeasurements, signal quality measurements, cell load measurements, ameasurement of radio link failures for incoming handovers, or acombination thereof.

The IPTV media system can include a super head-end office (SHO) 1710with at least one super headend office server (SHS) 1711 which receivesmedia content from satellite and/or terrestrial communication systems.In the present context, media content can represent, for example, audiocontent, moving image content such as 2D or 3D videos, video games,virtual reality content, still image content, and combinations thereof.The SHS server 1711 can forward packets associated with the mediacontent to one or more video head-end servers (VHS) 1714 via a networkof video head-end offices (VHO) 1712 according to a multicastcommunication protocol.

The VHS 1714 can distribute multimedia broadcast content via an accessnetwork 1718 to commercial and/or residential buildings 1702 housing agateway 1704 (such as a residential or commercial gateway). The accessnetwork 1718 can represent a group of digital subscriber line accessmultiplexers (DSLAMs) located in a central office or a service areainterface that provide broadband services over fiber optical links orcopper twisted pairs 1719 to buildings 1702. The gateway 1704 can usecommunication technology to distribute broadcast signals to mediaprocessors 1706 such as Set-Top Boxes (STBs) which in turn presentbroadcast channels to media devices 1708 such as computers or televisionsets managed in some instances by a media controller 1707 (such as aninfrared or RF remote controller).

The gateway 1704, the media processors 1706, and media devices 1708 canutilize tethered communication technologies (such as coaxial, powerlineor phone line wiring) or can operate over a wireless access protocolsuch as Wireless Fidelity (WiFi), Bluetooth, Zigbee, or other present ornext generation local or personal area wireless network technologies. Byway of these interfaces, unicast communications can also be invokedbetween the media processors 1706 and subsystems of the IPTV mediasystem for services such as video-on-demand (VoD), browsing anelectronic programming guide (EPG), or other infrastructure services.

A satellite broadcast television system 1729 can be used in the mediasystem of FIG. 17. The satellite broadcast television system can beoverlaid, operably coupled with, or replace the IPTV system as anotherrepresentative embodiment of communication system 1700. In thisembodiment, signals transmitted by a satellite 1715 that include mediacontent can be received by a satellite dish receiver 1731 coupled to thebuilding 1702. Modulated signals received by the satellite dish receiver1731 can be transferred to the media processors 1706 for demodulating,decoding, encoding, and/or distributing broadcast channels to the mediadevices 1708. The media processors 1706 can be equipped with a broadbandport to an Internet Service Provider (ISP) network 1732 to enableinteractive services such as VoD and EPG as described above.

In yet another embodiment, an analog or digital cable broadcastdistribution system such as cable TV system 1733 can be overlaid,operably coupled with, or replace the IPTV system and/or the satelliteTV system as another representative embodiment of communication system1700. In this embodiment, the cable TV system 1733 can also provideInternet, telephony, and interactive media services.

The subject disclosure can apply to other present or next generationover-the-air and/or landline media content services system.

Some of the network elements of the IPTV media system can be coupled toone or more computing devices 1730, a portion of which can operate as aweb server for providing web portal services over the ISP network 1732to wireline media devices 1708 or wireless communication devices 1716.

Communication system 1700 can also provide for all or a portion of thecomputing devices 1730 to function as a handover management server(herein referred to as server 1730). The server 1730 can use computingand communication technology to perform function 1762, which can includeamong other things, determining speed and acceleration for end userdevices (e.g., based on Doppler frequency), assigning the end userdevices to a select speed group from among a plurality of mobility speedgroups, and/or performing handover procedures based on parameters and/orpolicies associated with the select speed group. In one or moreembodiments, the wireless communication devices 1716 do not need to beprovisioned with functions to enable server 1730 to assign the speedgroup to the devices.

Multiple forms of media services can be offered to media devices overlandline technologies such as those described above. Additionally, mediaservices can be offered to media devices by way of a wireless accessbase station 1717 operating according to common wireless accessprotocols such as Global System for Mobile or GSM, Code DivisionMultiple Access or CDMA, Time Division Multiple Access or TDMA,Universal Mobile Telecommunications or UMTS, World interoperability forMicrowave or WiMAX, Software Defined Radio or SDR, Long Term Evolutionor LTE, IEEE 802.11 a/b/g/n/ac/ad and so on. Other present and nextgeneration wide area wireless access network technologies can be used inone or more embodiments of the subject disclosure.

FIG. 18 depicts an illustrative embodiment of a communication system1800 employing an IP Multimedia Subsystem (IMS) network architecture tofacilitate the combined services of circuit-switched and packet-switchedsystems. Communication system 1800 can be overlaid or operably coupledwith system 100 of FIG. 1 and communication system 1700 as anotherrepresentative embodiment of communication system 1800. System 1800enables monitoring a speed and an acceleration of a mobile communicationdevice in a serving cell of a wireless network, where the mobilecommunication device has a radio resource control connection with thewireless network. System 1800 also enables selecting a first mobilityspeed group from among a plurality of mobility speed groups based on thespeed and the acceleration of the mobile communication device, wherehandover parameters are assigned to each speed group of the plurality ofmobility speed groups, and where the handover parameters facilitate ahandover by the wireless network from the serving cell to a target cell.In one embodiment, system 1800 enables the monitoring of the speed andthe acceleration of the mobile communication device based on a Dopplerfrequency associated with the radio resource control connection betweenthe mobile communication device and the wireless network. In oneembodiment, system 1800 enables the monitoring of the speed and theacceleration of the mobile communication device to be commencedresponsive to a determination of a first triggering event, where thedetermination of the first triggering event is based on average pathloss measurements at the serving cell, signal quality measurements atthe serving cell, load measurements at the serving cell, a measurementof radio link failures for incoming handovers at the serving cell, ameasurement of session retainability at the serving cell, a measurementof handover performance at the serving cell, a measurement of throughputat the serving cell, a measurement of latency at the serving cell, or acombination thereof. In one embodiment, a threshold number ofmeasurements of the speed and the acceleration of the mobilecommunication device can be performed prior to the selecting of thefirst mobility speed group. In one embodiment, system 1800 enablesdetecting a change in the speed, the acceleration or a combinationthereof; identifying a last change of speed group for the mobilecommunication device; determining a time period associated with the lastchange; and selecting a second mobility speed group from among theplurality of mobility speed groups based on the change and responsive tothe time period satisfying a minimum threshold time between speed groupchanges.

Communication system 1800 can comprise a Home Subscriber Server (HSS)1840, a tElephone NUmber Mapping (ENUM) server 1830, and other networkelements of an IMS network 1850. The IMS network 1850 can establishcommunications between IMS-compliant communication devices (CDs) 1801,1802, Public Switched Telephone Network (PSTN) CDs 1803, 1805, andcombinations thereof by way of a Media Gateway Control Function (MGCF)1820 coupled to a PSTN network 1860. The MGCF 1820 need not be used whena communication session involves IMS CD to IMS CD communications. Acommunication session involving at least one PSTN CD may utilize theMGCF 1820.

IMS CDs 1801, 1802 can register with the IMS network 1850 by contactinga Proxy Call Session Control Function (P-CSCF) which communicates withan interrogating CSCF (I-CSCF), which in turn, communicates with aServing CSCF (S-CSCF) to register the CDs with the HSS 1840. To initiatea communication session between CDs, an originating IMS CD 1801 cansubmit a Session Initiation Protocol (SIP INVITE) message to anoriginating P-CSCF 1804 which communicates with a correspondingoriginating S-CSCF 1806. The originating S-CSCF 1806 can submit the SIPINVITE message to one or more application servers (ASs) 1817 that canprovide a variety of services to IMS subscribers.

For example, the application servers 1817 can be used to performoriginating call feature treatment functions on the calling party numberreceived by the originating S-CSCF 1806 in the SIP INVITE message.Originating treatment functions can include determining whether thecalling party number has international calling services, call IDblocking, calling name blocking, 7-digit dialing, and/or is requestingspecial telephony features (e.g., *72 forward calls, *73 cancel callforwarding, *67 for caller ID blocking, and so on). Based on initialfilter criteria (iFCs) in a subscriber profile associated with a CD, oneor more application servers may be invoked to provide various calloriginating feature services.

Additionally, the originating S-CSCF 1806 can submit queries to the ENUMsystem 1830 to translate an E.164 telephone number in the SIP INVITEmessage to a SIP Uniform Resource Identifier (URI) if the terminatingcommunication device is IMS-compliant. The SIP URI can be used by anInterrogating CSCF (I-CSCF) 1807 to submit a query to the HSS 1840 toidentify a terminating S-CSCF 1814 associated with a terminating IMS CDsuch as reference 1802. Once identified, the I-CSCF 1807 can submit theSIP INVITE message to the terminating S-CSCF 1814. The terminatingS-CSCF 1814 can then identify a terminating P-CSCF 1816 associated withthe terminating CD 1802. The P-CSCF 1816 may then signal the CD 1802 toestablish Voice over Internet Protocol (VoIP) communication services,thereby enabling the calling and called parties to engage in voiceand/or data communications. Based on the iFCs in the subscriber profile,one or more application servers may be invoked to provide various callterminating feature services, such as call forwarding, do not disturb,music tones, simultaneous ringing, sequential ringing, etc.

In some instances the aforementioned communication process issymmetrical. Accordingly, the terms “originating” and “terminating” inFIG. 18 may be interchangeable. It is further noted that communicationsystem 1800 can be adapted to support video conferencing. In addition,communication system 1800 can be adapted to provide the IMS CDs 1801,1802 with the multimedia and Internet services of communication system1700 of FIG. 17.

If the terminating communication device is instead a PSTN CD such as CD1803 or CD 1805 (in instances where the cellular phone only supportscircuit-switched voice communications), the ENUM system 1830 can respondwith an unsuccessful address resolution which can cause the originatingS-CSCF 1806 to forward the call to the MGCF 1820 via a Breakout GatewayControl Function (BGCF) 1819. The MGCF 1820 can then initiate the callto the terminating PSTN CD over the PSTN network 1860 to enable thecalling and called parties to engage in voice and/or datacommunications.

It is further appreciated that the CDs of FIG. 18 can operate aswireline or wireless devices. For example, the CDs of FIG. 18 can becommunicatively coupled to a cellular base station 1821, a femtocell, aWiFi router, a Digital Enhanced Cordless Telecommunications (DECT) baseunit, or another suitable wireless access unit to establishcommunications with the IMS network 1850 of FIG. 18. The cellular accessbase station 1821 can operate according to common wireless accessprotocols such as GSM, CDMA, TDMA, UMTS, WiMax, SDR, LTE, and so on.Other present and next generation wireless network technologies can beused by one or more embodiments of the subject disclosure. Accordingly,multiple wireline and wireless communication technologies can be used bythe CDs of FIG. 18.

Cellular phones supporting LTE can support packet-switched voice andpacket-switched data communications and thus may operate asIMS-compliant mobile devices. In this embodiment, the cellular basestation 1821 may communicate directly with the IMS network 1850 as shownby the arrow connecting the cellular base station 1821 and the P-CSCF1816.

It is further understood that alternative forms of a CSCF can operate ina device, system, component, or other form of centralized or distributedhardware and/or software. Indeed, a respective CSCF may be embodied as arespective CSCF system having one or more computers or servers, eithercentralized or distributed, where each computer or server may beconfigured to perform or provide, in whole or in part, any method, step,or functionality described herein in accordance with a respective CSCF.Likewise, other functions, servers and computers described herein,including but not limited to, the HSS, the ENUM server, the BGCF, andthe MGCF, can be embodied in a respective system having one or morecomputers or servers, either centralized or distributed, where eachcomputer or server may be configured to perform or provide, in whole orin part, any method, step, or functionality described herein inaccordance with a respective function, server, or computer.

The server 2130 of FIG. 21 can be operably coupled to the secondcommunication system 1800 for purposes similar to those described above.Server 1730 can perform function 1762 and thereby provide speedgroup-based handovers for the CDs 1802 and 1805 of FIG. 18. Server 1730can be an integral part of the application server(s) 1817 performingfunction 1872, which can be substantially similar to function 1762 andadapted to the operations of the IMS network 1850 or the server 1730 canbe a separate device.

For illustration purposes only, the terms S-CSCF, P-CSCF, I-CSCF, and soon, can be server devices, but may be referred to in the subjectdisclosure without the word “server.” It is also understood that anyform of a CSCF server can operate in a device, system, component, orother form of centralized or distributed hardware and software. It isfurther noted that these terms and other terms such as DIAMETER commandsare terms can include features, methodologies, and/or fields that may bedescribed in whole or in part by standards bodies such as 3^(rd)Generation Partnership Project (3GPP). It is further noted that some orall embodiments of the subject disclosure may in whole or in partmodify, supplement, or otherwise supersede final or proposed standardspublished and promulgated by 3GPP.

FIG. 19 depicts an illustrative embodiment of a communication device1900. Communication device 1900 can serve in whole or in part as anillustrative embodiment of the devices depicted in FIGS. 1, and 17-18.In one embodiment, device 1900 can be a mobile device that is in an RRCCONNECTION mode and moving through a cell. In this example, device 1900can be provided with wireless services including one or more handoversthat are according to a network-based speed and acceleration. Continuingwith this example, the device 1900 does not need to be provided withadditional functionality in order for speed group-based handovers sincethe network (e.g., the eNodeB) can estimate the speed and accelerationof the device based on various techniques (e.g., analysis of the Dopplereffect) that don't require utilizing the resources of the device forcalculating the speed and acceleration. In one embodiment, device 1900can be a server or other network element that performs the speedgroup-based handovers, such as determining speed and acceleration forend user devices (e.g., based on Doppler frequency), assigning the enduser devices to a select speed group from among a plurality of mobilityspeed groups, and/or performing handover procedures based on parametersand/or policies associated with the select speed group.

To enable these features, communication device 1900 can comprise awireline and/or wireless transceiver 1902 (herein transceiver 1902), auser interface (UI) 1904, a power supply 1914, a location receiver 1916,a motion sensor 1918, an orientation sensor 1920, and a controller 1906for managing operations thereof. The transceiver 1902 can supportshort-range or long-range wireless access technologies such asBluetooth, ZigBee, WiFi, DECT, or cellular communication technologies,just to mention a few. Cellular technologies can include, for example,CDMA-1X, UMTS/HSDPA, GSM/GPRS, TDMA/EDGE, EV/DO, WiMAX, SDR, LTE, aswell as other next generation wireless communication technologies asthey arise. The transceiver 1902 can also be adapted to supportcircuit-switched wireline access technologies (such as PSTN),packet-switched wireline access technologies (such as TCP/IP, VoIP,etc.), and combinations thereof.

The UI 1904 can include a depressible or touch-sensitive keypad 1908with a navigation mechanism such as a roller ball, a joystick, a mouse,or a navigation disk for manipulating operations of the communicationdevice 1900. The keypad 1908 can be an integral part of a housingassembly of the communication device 1900 or an independent deviceoperably coupled thereto by a tethered wireline interface (such as a USBcable) or a wireless interface supporting for example Bluetooth. Thekeypad 1908 can represent a numeric keypad commonly used by phones,and/or a QWERTY keypad with alphanumeric keys. The UI 1904 can furtherinclude a display 1910 such as monochrome or color LCD (Liquid CrystalDisplay), OLED (Organic Light Emitting Diode) or other suitable displaytechnology for conveying images to an end user of the communicationdevice 1900. In an embodiment where the display 1910 is touch-sensitive,a portion or all of the keypad 1908 can be presented by way of thedisplay 1910 with navigation features.

The display 1910 can use touch screen technology to also serve as a userinterface for detecting user input. As a touch screen display, thecommunication device 1900 can be adapted to present a user interfacewith graphical user interface (GUI) elements that can be selected by auser with a touch of a finger. The touch screen display 1910 can beequipped with capacitive, resistive or other forms of sensing technologyto detect how much surface area of a user's finger has been placed on aportion of the touch screen display. This sensing information can beused to control the manipulation of the GUI elements or other functionsof the user interface. The display 1910 can be an integral part of thehousing assembly of the communication device 1900 or an independentdevice communicatively coupled thereto by a tethered wireline interface(such as a cable) or a wireless interface.

The UI 1904 can also include an audio system 1912 that utilizes audiotechnology for conveying low volume audio (such as audio heard inproximity of a human ear) and high volume audio (such as speakerphonefor hands free operation). The audio system 1912 can further include amicrophone for receiving audible signals of an end user. The audiosystem 1912 can also be used for voice recognition applications. The UI1904 can further include an image sensor 1913 such as a charged coupleddevice (CCD) camera for capturing still or moving images.

The power supply 1914 can utilize common power management technologiessuch as replaceable and rechargeable batteries, supply regulationtechnologies, and/or charging system technologies for supplying energyto the components of the communication device 1900 to facilitatelong-range or short-range portable applications. Alternatively, or incombination, the charging system can utilize external power sources suchas DC power supplied over a physical interface such as a USB port orother suitable tethering technologies.

The location receiver 1916 can utilize location technology such as aglobal positioning system (GPS) receiver capable of assisted GPS foridentifying a location of the communication device 1900 based on signalsgenerated by a constellation of GPS satellites, which can be used forfacilitating location services such as navigation. The motion sensor1918 can utilize motion sensing technology such as an accelerometer, agyroscope, or other suitable motion sensing technology to detect motionof the communication device 1900 in three-dimensional space. Theorientation sensor 1920 can utilize orientation sensing technology suchas a magnetometer to detect the orientation of the communication device1900 (north, south, west, and east, as well as combined orientations indegrees, minutes, or other suitable orientation metrics).

The communication device 1900 can use the transceiver 1902 to alsodetermine a proximity to a cellular, WiFi, Bluetooth, or other wirelessaccess points by sensing techniques such as utilizing a received signalstrength indicator (RSSI) and/or signal time of arrival (TOA) or time offlight (TOF) measurements. The controller 1906 can utilize computingtechnologies such as a microprocessor, a digital signal processor (DSP),programmable gate arrays, application specific integrated circuits,and/or a video processor with associated storage memory such as Flash,ROM, RAM, SRAM, DRAM or other storage technologies for executingcomputer instructions, controlling, and processing data supplied by theaforementioned components of the communication device 1900.

Other components not shown in FIG. 19 can be used in one or moreembodiments of the subject disclosure. For instance, the communicationdevice 1900 can include a reset button (not shown). The reset button canbe used to reset the controller 1906 of the communication device 1900.In yet another embodiment, the communication device 1900 can alsoinclude a factory default setting button positioned, for example, belowa small hole in a housing assembly of the communication device 1900 toforce the communication device 1900 to re-establish factory settings. Inthis embodiment, a user can use a protruding object such as a pen orpaper clip tip to reach into the hole and depress the default settingbutton. The communication device 1900 can also include a slot for addingor removing an identity module such as a Subscriber Identity Module(SIM) card. SIM cards can be used for identifying subscriber services,executing programs, storing subscriber data, and so forth.

The communication device 1900 as described herein can operate with moreor less of the circuit components shown in FIG. 19. These variantembodiments can be used in one or more embodiments of the subjectdisclosure.

The communication device 1900 can be adapted to perform the functions ofthe media processor 1706, the media devices 1708, or the portablecommunication devices 1816 of FIG. 18, as well as the IMS CDs 1801-2202and PSTN CDs 1803-1805 of FIG. 18. It will be appreciated that thecommunication device 1900 can also represent other devices that canoperate in communication systems 1700-1800 of FIGS. 17-18 such as agaming console and a media player.

The communication device 1900 shown in FIG. 19 or portions thereof canserve as a representation of one or more of the devices of system 100 ofFIG. 1, communication system 1700, and communication system 1800. Inaddition, the controller 1906 can be adapted in various embodiments toperform the functions 1762 and 1872, respectively.

Upon reviewing the aforementioned embodiments, it would be evident to anartisan with ordinary skill in the art that said embodiments can bemodified, reduced, or enhanced without departing from the scope of theclaims described below. For example, historical data associated with aserving cell can be used in determining which speed group to which anend user device should be assigned. For example, historical dataindicating that a serving cell provides coverage to an area thathistorically has stop and go traffic can be used to adjust the number ofspeed and acceleration measurements to be obtained (e.g., sample size)before a speed group change is implemented. In other embodiments, thenumber of speed groups (and their corresponding handover parameters suchas filter coefficients) can change based on network conditions (e.g.,measured or historical conditions). In this example, a larger number ofspeed groups can be available for assignment under first networkconditions and a smaller number of speed groups can be available forassignment under second network conditions. In one or more embodiments,the functions described in the exemplary embodiments can be performed ina distributed environment, such as the eNodeB determining the speed andacceleration for end user devices (e.g., based on Doppler frequency),while another device performs assigning of the end user devices to aselect speed group from among a plurality of mobility speed groups,and/or performing handover procedures based on parameters and/orpolicies associated with the select speed group. Other embodiments canbe used in the subject disclosure.

It should be understood that devices described in the exemplaryembodiments can be in communication with each other via various wirelessand/or wired methodologies. The methodologies can be links that aredescribed as coupled, connected and so forth, which can includeunidirectional and/or bidirectional communication over wireless pathsand/or wired paths that utilize one or more of various protocols ormethodologies, where the coupling and/or connection can be direct (e.g.,no intervening processing device) and/or indirect (e.g., an intermediaryprocessing device such as a router).

FIG. 20 depicts an exemplary diagrammatic representation of a machine inthe form of a computer system 2000 within which a set of instructions,when executed, may cause the machine to perform any one or more of themethods describe above. One or more instances of the machine canoperate, for example, as the server 130 and/or 1730 and other devices ofFIGS. 1-3, 5-11 and 17-19. In some embodiments, the machine may beconnected (e.g., using a network 2026) to other machines. In a networkeddeployment, the machine may operate in the capacity of a server or aclient user machine in server-client user network environment, or as apeer machine in a peer-to-peer (or distributed) network environment.

The machine may comprise a server computer, a client user computer, apersonal computer (PC), a tablet PC, a smart phone, a laptop computer, adesktop computer, a control system, a network router, switch or bridge,or any machine capable of executing a set of instructions (sequential orotherwise) that specify actions to be taken by that machine. It will beunderstood that a communication device of the subject disclosureincludes broadly any electronic device that provides voice, video ordata communication. Further, while a single machine is illustrated, theterm “machine” shall also be taken to include any collection of machinesthat individually or jointly execute a set (or multiple sets) ofinstructions to perform any one or more of the methods discussed herein.

The computer system 2000 may include a processor (or controller) 2002(e.g., a central processing unit (CPU), a graphics processing unit (GPU,or both), a main memory 2004 and a static memory 2006, which communicatewith each other via a bus 2008. The computer system 2000 may furtherinclude a display unit 2010 (e.g., a liquid crystal display (LCD), aflat panel, or a solid state display. The computer system 2000 mayinclude an input device 2012 (e.g., a keyboard), a cursor control device2014 (e.g., a mouse), a disk drive unit 2016, a signal generation device2018 (e.g., a speaker or remote control) and a network interface device2020. In distributed environments, the embodiments described in thesubject disclosure can be adapted to utilize multiple display units 2010controlled by two or more computer systems 2000. In this configuration,presentations described by the subject disclosure may in part be shownin a first of the display units 2010, while the remaining portion ispresented in a second of the display units 2010.

The disk drive unit 2016 may include a tangible computer-readablestorage medium 2022 on which is stored one or more sets of instructions(e.g., software 2024) embodying any one or more of the methods orfunctions described herein, including those methods illustrated above.The instructions 2024 may also reside, completely or at least partially,within the main memory 2004, the static memory 2006, and/or within theprocessor 2002 during execution thereof by the computer system 2000. Themain memory 2004 and the processor 2002 also may constitute tangiblecomputer-readable storage media.

Dedicated hardware implementations including, but not limited to,application specific integrated circuits, programmable logic arrays andother hardware devices that can likewise be constructed to implement themethods described herein. Application specific integrated circuits andprogrammable logic array can use downloadable instructions for executingstate machines and/or circuit configurations to implement embodiments ofthe subject disclosure. Applications that may include the apparatus andsystems of various embodiments broadly include a variety of electronicand computer systems. Some embodiments implement functions in two ormore specific interconnected hardware modules or devices with relatedcontrol and data signals communicated between and through the modules,or as portions of an application-specific integrated circuit. Thus, theexample system is applicable to software, firmware, and hardwareimplementations.

In accordance with various embodiments of the subject disclosure, theoperations or methods described herein are intended for operation assoftware programs or instructions running on or executed by a computerprocessor or other computing device, and which may include other formsof instructions manifested as a state machine implemented with logiccomponents in an application specific integrated circuit or fieldprogrammable array. Furthermore, software implementations (e.g.,software programs, instructions, etc.) can include, but not limited to,distributed processing or component/object distributed processing,parallel processing, or virtual machine processing can also beconstructed to implement the methods described herein. It is furthernoted that a computing device such as a processor, a controller, a statemachine or other suitable device for executing instructions to performoperations or methods may perform such operations directly or indirectlyby way of one or more intermediate devices directed by the computingdevice.

While the tangible computer-readable storage medium 2022 is shown in anexample embodiment to be a single medium, the term “tangiblecomputer-readable storage medium” should be taken to include a singlemedium or multiple media (e.g., a centralized or distributed database,and/or associated caches and servers) that store the one or more sets ofinstructions. The term “tangible computer-readable storage medium” shallalso be taken to include any non-transitory medium that is capable ofstoring or encoding a set of instructions for execution by the machineand that cause the machine to perform any one or more of the methods ofthe subject disclosure.

The term “tangible computer-readable storage medium” shall accordinglybe taken to include, but not be limited to: solid-state memories such asa memory card or other package that houses one or more read-only(non-volatile) memories, random access memories, or other re-writable(volatile) memories, a magneto-optical or optical medium such as a diskor tape, or other tangible media which can be used to store information.Accordingly, the disclosure is considered to include any one or more ofa tangible computer-readable storage medium, as listed herein andincluding art-recognized equivalents and successor media, in which thesoftware implementations herein are stored.

Although the present specification describes components and functionsimplemented in the embodiments with reference to particular standardsand protocols, the disclosure is not limited to such standards andprotocols. Each of the standards for Internet and other packet switchednetwork transmission (e.g., TCP/IP, UDP/IP, HTML, HTTP) representexamples of the state of the art. Such standards are from time-to-timesuperseded by faster or more efficient equivalents having essentiallythe same functions. Wireless standards for device detection (e.g.,RFID), short-range communications (e.g., Bluetooth, WiFi, Zigbee), andlong-range communications (e.g., WiMAX, GSM, CDMA, LTE) can be used bycomputer system 2000.

The illustrations of embodiments described herein are intended toprovide a general understanding of the structure of various embodiments,and they are not intended to serve as a complete description of all theelements and features of apparatus and systems that might make use ofthe structures described herein. Many other embodiments will be apparentto those of skill in the art upon reviewing the above description. Otherembodiments may be utilized and derived therefrom, such that structuraland logical substitutions and changes may be made without departing fromthe scope of this disclosure. Figures are also merely representationaland may not be drawn to scale. Certain proportions thereof may beexaggerated, while others may be minimized. Accordingly, thespecification and drawings are to be regarded in an illustrative ratherthan a restrictive sense.

Although specific embodiments have been illustrated and describedherein, it should be appreciated that any arrangement calculated toachieve the same purpose may be substituted for the specific embodimentsshown. This disclosure is intended to cover any and all adaptations orvariations of various embodiments. Combinations of the aboveembodiments, and other embodiments not specifically described herein,can be used in the subject disclosure. In one or more embodiments,features that are positively recited can also be excluded from theembodiment with or without replacement by another component or step. Thesteps or functions described with respect to the exemplary processes ormethods can be performed in any order. The steps or functions describedwith respect to the exemplary processes or methods can be performedalone or in combination with other steps or functions (from otherembodiments or from other steps that have not been described). Less thanall of the steps or functions described with respect to the exemplaryprocesses or methods can also be performed in one or more of theexemplary embodiments. Further, the use of numerical terms to describe adevice, component, step or function, such as first, second, third, andso forth, is not intended to describe an order or function unlessexpressly stated so. The use of the terms first, second, third and soforth, is generally to distinguish between devices, components, steps orfunctions unless expressly stated otherwise. Additionally, one or moredevices or components described with respect to the exemplaryembodiments can facilitate one or more steps or functions, where thefacilitating (e.g., facilitating access or facilitating establishing aconnection) can include less than all of the steps needed to perform thefunction or can include all of the steps of the function.

In one or more embodiments, a processor (which can include a controlleror circuit) has been described that performs various functions. Itshould be understood that the processor can be multiple processors,which can include distributed processors or parallel processors in asingle machine or multiple machines. The processor can be used insupporting a virtual processing environment. The virtual processingenvironment may support one or more virtual machines representingcomputers, servers, or other computing devices. In such virtualmachines, components such as microprocessors and storage devices may bevirtualized or logically represented. The processor can include a statemachine, application specific integrated circuit, and/or programmablegate array including a Field PGA. In one or more embodiments, when aprocessor executes instructions to perform “operations”, this caninclude the processor performing the operations directly and/orfacilitating, directing, or cooperating with another device or componentto perform the operations.

The Abstract of the Disclosure is provided with the understanding thatit will not be used to interpret or limit the scope or meaning of theclaims. In addition, in the foregoing Detailed Description, it can beseen that various features are grouped together in a single embodimentfor the purpose of streamlining the disclosure. This method ofdisclosure is not to be interpreted as reflecting an intention that theclaimed embodiments require more features than are expressly recited ineach claim. Rather, as the following claims reflect, inventive subjectmatter lies in less than all features of a single disclosed embodiment.Thus the following claims are hereby incorporated into the DetailedDescription, with each claim standing on its own as a separately claimedsubject matter.

What is claimed is:
 1. A method comprising: detecting, by a systemincluding a processor, a mobile communication device having a radioresource control connection with a wireless network; monitoring, by thesystem, for a first triggering event associated with the mobilecommunication device; responsive to the first triggering event,monitoring, by the system, a speed and an acceleration of the mobilecommunication device in a serving cell of the wireless network; andselecting, by the system, a first mobility speed group from among aplurality of mobility speed groups based on the speed and theacceleration of the mobile communication device, wherein handoverparameter values are assigned to each speed group of the plurality ofmobility speed groups, and wherein the handover parameter values areutilized for a handover by the wireless network from the serving cell toa target cell.
 2. The method of claim 1, wherein the handover parametervalues are communicated to the mobile communication device via adedicated signaling message, wherein the monitoring of the speed and theacceleration of the mobile communication device is based on a Dopplerfrequency associated with the radio resource control connection betweenthe mobile communication device and the wireless network, and whereinthe monitoring for the first triggering event is based on average pathloss measurements at the serving cell, signal quality measurements atthe serving cell, load measurements at the serving cell, a measurementof radio link failures for incoming handovers at the serving cell, or acombination thereof.
 3. The method of claim 2, wherein the firsttriggering event occurs prior to a first handover for the radio resourcecontrol connection between the mobile communication device and thewireless network, and further comprising: detecting, by the system, achange in the speed, the acceleration or a combination thereof; andselecting, by the system, a second mobility speed group from among theplurality of mobility speed groups based on the change.
 4. The method ofclaim 1, comprising: monitoring, by the system, for a second triggeringevent associated with the mobile communication device; and responsive tothe second triggering event, ceasing the monitoring, by the system, ofthe speed and the acceleration of the mobile communication device. 5.The method of claim 4, wherein the monitoring for the second triggeringevent is based on average path loss measurements, signal qualitymeasurements, cell load measurements, a measurement of radio linkfailures for incoming handovers, or a combination thereof.
 6. The methodof claim 1, wherein the monitoring for the first triggering event isbased on a measurement of session retainability at the serving cell, ameasurement of handover performance at the serving cell, a measurementof throughput at the serving cell, a measurement of latency at theserving cell or a combination thereof.
 7. The method of claim 1, whereinthe system performs a threshold number of measurements of the speed andthe acceleration of the mobile communication device prior to selectingthe first mobility speed group.
 8. The method of claim 1, wherein thesystem operates as an eNodeB of the wireless network.
 9. The method ofclaim 1, comprising: detecting, by the system, a change in the speed,the acceleration or a combination thereof; identifying, by the system, alast change of speed group for the mobile communication device;determining a time period associated with the last change; andselecting, by the system, a second mobility speed group from among theplurality of mobility speed groups based on the change and responsive tothe time period satisfying a minimum threshold time between speed groupchanges.
 10. The method of claim 1, wherein the monitoring of the speedand the acceleration of the mobile communication device is based ondetermining a Doppler frequency offset according to phase differences ofreference symbols received by the system.
 11. The method of claim 1,wherein the monitoring of the speed and the acceleration of the mobilecommunication device is based on measuring a fast fading changeassociated with the radio resource control connection between the mobilecommunication device and the wireless network.
 12. A server comprising:a memory to store executable instructions; and a processor coupled withthe memory, wherein the processor, responsive to executing theexecutable instructions, performs operations comprising: detecting amobile communication device having a radio resource control connectionwith a wireless network; monitoring a speed and an acceleration of themobile communication device in a serving cell of the wireless network;and selecting a first mobility speed group from among a plurality ofmobility speed groups based on the speed and the acceleration of themobile communication device, wherein handover parameter values areassigned to each speed group of the plurality of mobility speed groups,and wherein the handover parameter values are utilized for a handover bythe wireless network from the serving cell to a target cell.
 13. Theserver of claim 12, wherein the monitoring of the speed and theacceleration of the mobile communication device is commenced responsiveto a determination of a first triggering event, and wherein the firsttriggering event occurs prior to a first handover for the radio resourcecontrol connection between the mobile communication device and thewireless network.
 14. The server of claim 12, wherein the operationsfurther comprise monitoring for a first triggering event associated withthe mobile communication device, wherein the monitoring of the speed andthe acceleration of the mobile communication device is commencedresponsive to the first triggering event, and wherein the monitoring forthe first triggering event is based on average path loss measurements atthe serving cell, signal quality measurements at the serving cell, loadmeasurements at the serving cell, a measurement of radio link failuresfor incoming handovers at the serving cell, a measurement of sessionretainability at the serving cell, a measurement of handover performanceat the serving cell, a measurement of throughput at the serving cell, ameasurement of latency at the serving cell, or a combination thereof.15. The server of claim 12, wherein the monitoring of the speed and theacceleration of the mobile communication device is based on determininga Doppler frequency offset according to phase differences of referencesymbols received by the processor, measuring a fast fading changeassociated with the radio resource control connection between the mobilecommunication device and the wireless network, or a combination thereof.16. The server of claim 12, wherein the processor performs a thresholdnumber of measurements of the speed and the acceleration of the mobilecommunication device prior to the selecting of the first mobility speedgroup, and wherein the operations further comprise: detecting a changein the speed, the acceleration or a combination thereof; identifying alast change of speed group for the mobile communication device;determining a time period associated with the last change; and selectinga second mobility speed group from among the plurality of mobility speedgroups based on the change and responsive to the time period satisfyinga minimum threshold time between speed group changes.
 17. The server ofclaim 12, wherein the operations further comprise: monitoring for asecond triggering event associated with the mobile communication device;and responsive to the second triggering event, ceasing the monitoring ofthe speed and the acceleration of the mobile communication device,wherein the monitoring for the second triggering event is based onaverage path loss measurements, signal quality measurements, cell loadmeasurements, a measurement of radio link failures for incominghandovers, or a combination thereof.
 18. A computer readable storagedevice comprising executable instructions, which, responsive to beingexecuted by a processor cause the processor to perform operationscomprising: monitoring a speed and an acceleration of a mobilecommunication device in a serving cell of a wireless network, whereinthe mobile communication device has a radio resource control connectionwith the wireless network; and selecting a first mobility speed groupfrom among a plurality of mobility speed groups based on the speed andthe acceleration of the mobile communication device, wherein handoverparameter values are assigned to each speed group of the plurality ofmobility speed groups, and wherein the handover parameter values areutilized for a handover by the wireless network from the serving cell toa target cell.
 19. The computer readable storage device of claim 18,wherein the monitoring of the speed and the acceleration of the mobilecommunication device is based on a Doppler frequency associated with theradio resource control connection between the mobile communicationdevice and the wireless network, wherein the monitoring of the speed andthe acceleration of the mobile communication device is commencedresponsive to a determination of a first triggering event, and whereinthe determination of the first triggering event is based on average pathloss measurements at the serving cell, signal quality measurements atthe serving cell, load measurements at the serving cell, a measurementof radio link failures for incoming handovers at the serving cell, ameasurement of session retainability at the serving cell, a measurementof handover performance at the serving cell, a measurement of throughputat the serving cell, a measurement of latency at the serving cell, or acombination thereof.
 20. The computer readable storage device of claim18, wherein the processor performs a threshold number of measurements ofthe speed and the acceleration of the mobile communication device priorto the selecting of the first mobility speed group, and wherein theoperations further comprise: detecting a change in the speed, theacceleration or a combination thereof; identifying a last change ofspeed group for the mobile communication device; determining a timeperiod associated with the last change; and selecting a second mobilityspeed group from among the plurality of mobility speed groups based onthe change and responsive to the time period satisfying a minimumthreshold time between speed group changes.